After turning on the iMac, how silent should the computer be? 'Cause I can definitely hear a slightly subtle 'wooshing' sound of the fan in a quiet room. I did upgrade my iMac with the new FusionDrive hoping to eliminate a significant amount of fan noise. Did I receive a lemon???

Don't worry. My 27" has a constant fan sound as well. It's not really loud or annoying or anything but you can hear it when the room is really quiet.
It think that's normal and just the way it is since other people have reported the same.

lol! you should get it replaced. i just ran photoshop on mine, i still get the constant ongoing "whoosh" sound. similar to a jet plane mid-flight on cruise control...

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Originally Posted by sjz88

Don't worry. My 27" has a constant fan sound as well. It's not really loud or annoying or anything but you can hear it when the room is really quiet.
It think that's normal and just the way it is since other people have reported the same.

Do you happen to know what your fan speed is? I just downloaded iStat Menus at it says my main fan speed is currently at 1399rpm. The sound isn't annoying, it just seems that my system is being overworked for nothing.

After turning on the iMac, how silent should the computer be? 'Cause I can definitely hear a slightly subtle 'wooshing' sound of the fan in a quiet room. I did upgrade my iMac with the new FusionDrive hoping to eliminate a significant amount of fan noise. Did I receive a lemon???

Thanks guys.

The fusion drive does nothing to reduce noise, if anything the additional flash storage module adds to noise by generating more heat than a HDD alone requiring the system fan to run longer and possibly at a higher RPM.

Unfortunately Apple doesn't offer a flash only or SSD only option which would have eliminated the HDD noise and cut down the system fan even further since a SSD or flash module generates less heat than a HDD.

The fusion drive does nothing to reduce noise, if anything the additional flash storage module adds to noise by generating more heat than a HDD alone requiring the system fan to run longer and possibly at a higher RPM.

Unfortunately Apple doesn't offer a flash only or SSD only option which would have eliminated the HDD noise and cut down the system fan even further since a SSD or flash module generates less heat than a HDD.

So my fan speed at 1398rpm is considered normal? Thanks for your input.